Tga*ctga+sina помогите решить

tga*ctga+sina=1+sina=sin^2a+cos^2a+sina=sina(sina+cos^2)

%28tg+%5Calpha+%2Bctg+%5Calpha+%29%5Cbullet+%5Csin+%5Calpha+%5Cbullet%5Ccos+%5Calpha+%3D%28%5Cfrac%7B%5Csin+%5Calpha+%7D%7B%5Ccos+%5Calpha%7D+%2B%5Cfrac%7B%5Ccos+%5Calpha+%7D%7B%5Csin%5Calpha%7D+%29%5Cbullet+%5Csin+%5Calpha+%5Cbullet%5Ccos+%5Calpha%3D%5C%5C%5C%5C%3D%28%5Cfrac%7B%5Csin%5E2+%5Calpha+%7D%7B%5Ccos+%5Calpha%7D+%2B%5Ccos+%5Calpha%29+%5Cbullet%5Ccos+%5Calpha%3D%5Csin%5E2+%5Calpha+%2B%5Ccos%5E2+%5Calpha%3D1.стафь спасибо